Abstract
Poplars accumulate high B concentrations and are thus used for the phytomanagement of B contaminated soils. Here, we performed pot experiments in which Populus nigra × euramericana were grown on a substrate with B concentrations ranging from 13 to 280 mg kg(-1) as H(3)BO(3). Salix viminalis, Brassica juncea, and Lupinus albus were grown under some growing conditions for comparison. Poplar growth was unaffected at soil B treatment levels up to 93 mg kg(-1). Growth was progressively reduced at levels of 168 and 280 mg kg(-1). None of the other species survived at these substrate B levels. At leaf B concentrations <900 mg kg(-1) only <10% of the poplar leaf area showed signs of toxicity. Neutron radiography revealed that chlorotic leaf tissues had B concentrations of 1000-2000 mg kg(-1), while necrotic tissues had >2000 mg kg(-1). Average B concentrations of up to 3500 mg kg(-1) were found in leaves, while spots within leaves had concentrations >7000 mg kg(-1), showing that B accumulation in leaf tissue continued even after the onset of necrosis. The B accumulation ability of P. nigra × euramericana is associated with B hypertolerance in the living tissue and storage of B in dead leaf tissue.
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Claims 5
Claim · model-written summary
Poplar growth was unaffected up to 93 mg kg(-1) soil boron.
PopulusNot reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Poplar growth was unaffected at soil B treatment levels up to 93 mg kg(-1)”
Claim · model-written summary
Poplar growth declined at 168 and 280 mg kg(-1) boron.
- Taxon
- Populus nigra × euramericana
Populus nigrat0 - Treatment
- levels of 168 and 280 mg kg(-1)e0
- Outcome
- Growthe0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Growth was progressively reduced at levels of 168 and 280 mg kg(-1)”
t0“Populus nigra × euramericana”
Claim · model-written summary
Other tested species did not survive at those boron levels.
- Outcome
- None of the other species survivede0
Not reportedTaxon
Verbatim
e0“None of the other species survived at these substrate B levels”
Claim · model-written summary
Poplar leaves contained up to 3500 mg kg(-1) boron on average.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Average B concentrations of up to 3500 mg kg(-1) were found in leaves”
t0“Poplar”
Claim · model-written summary
Poplar leaf spots contained more than 7000 mg kg(-1) boron.
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“spots within leaves had concentrations >7000 mg kg(-1)”
t0“Poplar”
The same questions in other papers
boron atom · growth · Populus (poplar)Results agree
1 paper in the same direction as this paper
- no effect
Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.